Are cloud bases in new METAR system in AGL or MSL?

I looked at the custom weather settings and noticed the lowest point of cloud altitude is now -1640 instead of 0 before SU7. Could it be that live weather thinks -1640 is 0 and sets the clouds from -1640 instead. Lets say clouds should be at 1640ft height they are set in the sim at 0ft instead?

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